At least one and a half million species have been discovered so far, and every year more are discovered as remote terrestrial and marine areas are explored. The scientific community estimates that there are still between 5 and 30 million undiscovered species, and even some researchers state that up to a hundred million species remain undiscovered.
However, the International Union for Conservation of Nature estimates that between 10,000 and 50,000 species disappear every year -from 27 to 136 a day!- many of them due to human action. As a result of climate change, deforestation, droughts or floods, the habitats of many species are altered and become uninhabitable and they end up disappearing.
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